Applejack farts at dinner.

NOW WITH NO PICTURES OF GAY MEN KISSING

I'm sorry Meeester
I wrote this at 4:00am, expect the worst.

A human winds up in Equestria. Unbeknownst to said human the fate of the entire world rests on his shoulders.

Everyone knows that ponies are plants, and like plants they breathe pure Carbon Dioxide. What happens when the evil Oxygen invades their plant lungs? Oxygensplosion!